This happened the day before as well, leaving me struggling to make a place I thought I could make easily.

So it looks like I have a Model S 81D not a 90D like I thought. What experience do people have of this sort of thing?

The only thing I can think of is the low temperature (8 deg at start of day). Consulting the manual ... "Note: A portion of the battery image may appear blue. This indicates that a small portion of the energy stored in the battery is not available on your drive because the battery is cold. This is normal and no reason for concern. When the battery warms up, the blue portion is no longer displayed." But in my case there was no blue portion.

This happened the day before as well, leaving me struggling to make a place I thought I could make easily.

So it looks like I have a Model S 81D not a 90D like I thought. What experience do people have of this sort of thing?

The only thing I can think of is the low temperature (8 deg at start of day). Consulting the manual ... "Note: A portion of the battery image may appear blue. This indicates that a small portion of the energy stored in the battery is not available on your drive because the battery is cold. This is normal and no reason for concern. When the battery warms up, the blue portion is no longer displayed." But in my case there was no blue portion.

You are assuming that the car motor can draw up to 100% of the advertised 90kWh. It cannot. A certain percentage is that is not available to you, it is reserved for other purposes. I think all EVs do that.

You are assuming that the car motor can draw up to 100% of the advertised 90kWh. It cannot. A certain percentage is that is not available to you, it is reserved for other purposes. I think all EVs do that.

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No, the losses due to inefficiencies are accounted for. The energy is measured at the battery. The fact that the motor only converts 90% of it's energy to motion doesn't matter. The energy counter measures everything taken from the battery, how it is used and how efficient energy conversion is is irrelevant.

The 90 battery doesn't have truly 90 kWh. It's a little less. The bottom 4-5% is not available for driving as it's kind of a safety buffer to keep the battery from being damaged. Here is an example: When my 85 was new, I was able to get 76.5 kWh out of it at the most before it was at zero.

I know this nice looking graphic shows up a lot, but it is NOT accurate. We have evidence that the total battery capacity of an 85 battery is not 85 kWh. It is only around 79ish. It is based on people who took apart a Tesla 85 battery and tested the cells exactly.
Whoever made this graphic made up numbers, but they are not correct.

My calculations based on a year of driving and observing charge percentages etc is that a 60kWh has about 55kWh usable. Ie every 10% is 5.5kWh and when charged to 100% you have 55kWh to expend before it will show 0%.

This is for the original 60 of course, the new one being a 75kWh pack with software limitation and so presumably has a full 60kWh available to use.